I have talked about the same thing, I have asked a couple guys with late model dually's with the bigger truck campers and have been told 11-13. Its the wind resistance that kills you. I figure for the extra cost of the truck camper, lose of living space, its just not worth it.
I was wondering the same thing. I have a 38ft toy hauler and had considered getting a truck camper and another enclosed trailer if I got to start racing again. I get between 9 and 11 towing my 5th wheel so I may not be any better off unless I get into off roading. I can fit all my bikes in the toy hauler so I will probably just keep it. I just can't get to all the places that I want to go everytime. The size gets in the way.
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